Improvement in metal cans oe cases foe putting up alkalies



gui t 2h glans item: g fficn,

JOHN MCCOY, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO HIMSELF AN D W. T. SNELL, OF SAME PLACE.

Letters Patent No. 77,899, dated May 12, 1868.-

hip fitlgrhule meat in in tlg ese senescent nut making me tip same.

TO ALL -WHOM IT MAY CONCERN: 7

Be it known that'I, JoIIuMcOoY, of Philadelphia, Pennsylvania, have invented an Improvement in Metal Cans or Cases; and I do hereby' declare the following to be a full, clear, and exact description of the same,

reference being had to the uccompanyipg drawing, and to the letters of reference marked thereon. 9,

My improved can or case consists of abody, bottom, an inner annular cover and outer cover, all composed of sheet iron, or other metal, and secured by lap-joints, in the manner described hereafter, so as to form a more secure vessel for containing alkali than the usual tin cans. p

In order to enable others skilled in the art to make my invention, I will now proceed to describethe manner of carrying it into efieet, reference being had to the accompanying drawing, which forms a part of this specification, and in wbich-- Figure 1 represents, partly in section, my im roved can or case, as it appears when cbmplete.

Figure 2, part of fig. 1, drawn to an enlarged scale.

Figures 3 and 4:,sectional views, illustrating my invention; and

Figure 5, a'plan view partly in section.

Similar letters refer to similar parts throughout the several views. i i

The cases 'or cans heretofore used for containing alkali for washing purposes have generally been made of tinned plates, with joints, secured by solder. It has been usral to complete the cans, with the exception of one end, which was left open for the introduction of the material, in a hot and fluid state, and, before the material was quite cold, to solder on the cover; i i Causticalkali has this peculiarity that immediately after becoming cold and hard it will bccomeliquid if 'exposed to'the air, and in this state it has such an eflect on the solder as to destroy its tenacity; hence, if there is an imperfect joint, so as to permit leakage, on the access of air tothc contents, the result will be not only the destruction-of the can itself, but that of other caseswhieh may be contained in the same package, and ,to

which'the liquid alkali from the lealcy case may gain access. In order to obviate these difficulties, I makethe can or cases, by-prefercnce, of thin sheet iron, having the smooth and polished surface similar to that of Russian iron, and, discarding solder, rely upon perfect lapped joints for security. i

In the drawing, A represents the cylindrical body of the can or case, made by bending strip of the sheet,

iron," and securing the ends together by a lap-joint.

At the lower end of tllc body is formed an inclined or flaring flange, which is confined between a fold formed on the edge of the bottom, a, of the can.

, t There are two tops to the can, the inner-top, b, and outer top, d, fig. Q, the former consisting of an annular plate, the edge of which is folded over the bevelled edge of the upper end of the body.

The can or case is now in a condition to receive the alkali, which is poured in a hot state through the central opening 0, of the inner cover 6. When the material has become hard, and before it is cold enough to liquefy, the outer cover cl isapplied, its folded edge overlapping that of-the inner cover, as shown in fig. 2,

after which the can is completed and ready to be packed with others for transportation or storage.

The sheet iron is much better adapted to resist/the action of the alkali than tinned plates, for the reason given above, but the iron is so thin and light that I have adopted the inner or supplementary cover 12 to keep the can' in proper shape for the reception of the outer cover, and to prevent the distortion of the can by-the hot alkali, as such distortion would-interfere with the required rapid application of the outer cover.

I claim as my invention, and desire to secure by Letters Patent-e Tlxe within-dcscribed can or case, composed of the body A, bottom, a, innci'annular cover 6, and outer cover :1, all being arranged and secured by lap-joints, as set forthfer the purposespecified;

In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses.

JOHN McCOY.

Witnesses:

H, Howson; W. J. R. DELANY. 

